The 15" Q switchout is DONE

[Ryan Autry 10+ year member]

Ryan knows what he's doing... there's no disputing that .. I wouldn't try to hate on him too much..
Loyd L.

Thank you.

 

[lilmaniac2 5,000+ posts]

yes smart *** remarks

Ok, since I don't know how to design boxes, I'll let you...

i really wanna know what port velocity has to do with anything... maybe im a noob when i comes to this as ive never heard it discussed before. Ive never heard a dbdragger concerned with how much port velocity he had.

im not trying to be a smart *** here as i really have never even worried about the port velocity... how do u measure that? velocitometer in the port?

 

[Ryan Autry 10+ year member]

yes smart *** remarks

That wasn't a "smart *** remark". I was stating the obvious from what everyone had been saying on here.

i really wanna know what port velocity has to do with anything... maybe im a noob when i comes to this as ive never heard it discussed before. Ive never heard a dbdragger concerned with how much port velocity he had.

VV is very important. Especially when the port is right behind your head. Port noise can be an ugly hindrance to to your system.

Luckily we're not "dbdraggers".

im not trying to be a smart *** here as i really have never even worried about the port velocity... how do u measure that? velocitometer in the port?

BBP6 will calculate Vent Velocity for you.

 

[lilmaniac2 5,000+ posts]

so how is VV related to port noise.. maybe we should make anew thread instead of jacking this one further?

 

[snoopdan 5,000+ posts]

so how is VV related to port noise.. maybe we should make anew thread instead of jacking this one further?

ouch //content.invisioncic.com/y282845/emoticons/blackeye.gif.66a1670f5aaf7f406e783a63e3387dc5.gif//content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif

I gotta admit, worrying about vent velocity is kinda silly, I mean....be aware of dynamic pressure flow thru a port and all, and BBP will attempt to give you a soild number on this, but its absurdly hypothetical.

carry on, that is all.....//content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif

 

[Ryan Autry 10+ year member]

so how is VV related to port noise.. maybe we should make anew thread instead of jacking this one further?

Vent Velocity IS port noise, typically anything over 36 m/s. But we like to keep it under 20m/sec or so.

Come now... are you being sarcastic, or serious?

 

[bigbassman Premium Member]

I've never been a fan of anything any lumping program said...

but I'm an ******* like that...

and ponies

Loyd L.

 

[lilmaniac2 5,000+ posts]

dead serious. i have never calculated VV as i didnt know it was possible... i always just went by experience in designing boxes... hasnt failed me yet. i usually tend to use larger ports for woofers that have higher excursion....

and snoop how do u know its just a guess.... that makes me think that using BB6 or what ever is as useless as winisd

 

[snoopdan 5,000+ posts]

dead serious. i have never calculated VV as i didnt know it was possible... i always just went by experience in designing boxes... hasnt failed me yet. i usually tend to use larger ports for woofers that have higher excursion....
and snoop how do u know its just a guess.... that makes me think that using BB6 or what ever is as useless as winisd

well kids, wecome to mr. snoops world of elementry tactile physics, where we can use software to make imaginary figures that are based on vent constraints and air volume, then absolutely not take in to account for surface structure of the vent port, nor how much acutal surface tension is indeed interacting with the airflow exiting the port. YEP KIDS, we're in BBPland! //content.invisioncic.com/y282845/emoticons/naughty.gif.94359f346c0f1259df8038d60b41863e.gif

 

[ray@ss 10+ year member]

Well, after reading all these posts about a box i built, I figured that I would stop in and speak my peace.

Sure the software estimates the vv, along with other things. The thing is that it "GUESSES" alot better than I do. Not saying that there might be some miracle short hand way of enclosure design, but this is what I have and I have not seen it let me down yet.

As far as Manny's enclosure is concerned, Hmmm... Well I have all ready offered to give it another go, although I see no problem with the current setup.

When he comes back down, I will drop in 2 05 xxx's and give that a go.

Now am I partial to a certain loudness of low bass? Probably, since I am comparing this FI woofer to a "real" low-end monster. The 06 xxx.

Thoughts that came to mind when judging how to design this box was the enclosure I built for the 06 xxx 12 sitting my shop. displacement is very similar between the 2, on my xxx box it has 36sqin and is tuned to 36 hz , and will devastate these fi's on the really low stuff.

So is my enclosure off on that 1? Or is there a slight chance that the woofer actually does have something to do with response?

BTW what was the f/s of this woofer again?

yeah I know Im a jackass, and I know everyone is better than me...Obviously

I dont use big words, hell Im just an installer.

 

[ray@ss 10+ year member]

The Ford lightning with 2 06 xxx 12's, 1000rms each 4.5ctft after total, 70sqin of port tuned at 36hz.

Now Manny answer this for me... was this truck loud on the really low stuff. Please be honest. ???

So to recap, very close to the same displacement, in a box 1/2 the size, same port area, droppin' low like no other. HMMMMMMM

Thanks

 

[danteBirosel 5,000+ posts]

Yo i'm going to sac town tomorrow afternoon for 4 days, ill be posted in this place called "Elk Grove,Ca" sound familiar?

if its not that far to meet up from that area, ill bring my termlab with me.

-dante

 

[ngsm13 5,000+ posts]

Doing a box for a single 15 Q soon, it'll be 3.9cubes NET tuned to 30hz with 65sq. in. of port.

Also doing a 6.6cubes enclosure... which will have 120 sq. in. of port.

Stuff the box with polyfill. Go with a larger port. Who knows, I'll have my opinions son enough when I hear it with my own ears.

nG

 

[mannyb18b]

The Ford lightning with 2 06 xxx 12's, 1000rms each 4.5ctft after total, 70sqin of port tuned at 36hz.
Now Manny answer this for me... was this truck loud on the really low stuff. Please be honest. ???

So to recap, very close to the same displacement, in a box 1/2 the size, same port area, droppin' low like no other. HMMMMMMM

Thanks

Very loud on the low stuff...to say the least.

And yes Elk Grove is like 25min. from here maybe closer

 

[mannyb18b]

lol, oh and ya I forgot this time around Scott sent me dual 2's so I actually had them wired in series so the amp was seeing a 2ohm load an only giving each like 300watts. Either way shouldnt change the sound too much, but //content.invisioncic.com/y282845/emoticons/blackeye.gif.66a1670f5aaf7f406e783a63e3387dc5.gif for me. Anyways tom. I'll have them wired right, but still, shouldnt change too much. But we will see